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Specific and Non-specific Index Selection in Soybeans, Glycine max L. (Merrill)¹

General, average, and specific index selection were evaluated for yield advance in two populations over three environments. In all environments, predicted genetic advance was greatest for the specific index from each population, but specific indices were generally less efficient for actual yield advance over environments than were yield truncation and the general index. Relationships among traits were reasonably comparable for closely related crosses, and for early generation and later generation material from these crosses. Average relationships among traits for non-related soybean populations had utility in selection of specific breeding populations of Midwest soybeans.

The use of high performance environments resulted in maximum predictions of genetic advance, but actual yield advance evaluated over environments was essentially equal for all environments tested. Actual advance evaluated over environments may be the only accurate criterion for comparison of selection procedures in the presence of substantial genotype x environmental interactions.

Key Words: Selection procedures • Index selection • Breeding • Genetics

² Senior Lecturer, Department of Agriculture, University of Queensland, Brisbane, Australia (formerly Graduate Assistant and CSIRO Student, Agronomy Department, Ames, Iowa); Research Agronomist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland; and Director of Research, Peterson Seed Co., Waterloo, Iowa, and Savage, Minn., (formerly Agronomist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and Professor of Agronomy, Iowa State University, Ames, Iowa), respectively.

Received for publication August 6, 1969.